Environmental advocates yesterday called for action to reverse alleged breakdown of the algal reef near the third liquefied natural gas (LNG) terminal at Guantang Industrial Port (觀塘工業港), saying it was likely caused by the construction of the terminal over the past few years.
The terminal, known as the Guantang LNG Plant in
Taoyuan’s Guanyin District (觀音), is run by CPC Corp, Taiwan after the company obtained development rights in 2017 through acquisition of Tungting Liquefied Gas Industrial Co, the original developer.
Photo: Taipei Times
Construction began in November 2019 after the then-Environmental Protection Administration’s environmental impact assessment committee approved the project and proposed measures against potential environmental impact.
The terminal came online in May last year.
Environmentalist Pan Chong-cheng (潘忠政), who initiated a referendum in 2020 aiming to relocate the terminal, yesterday told a news conference that algal reefs in the district are the largest remaining habitat for Polycyathus isabela a Taiwanese endemic coral species classified as critically endangered.
The algal reef ecosystem along the coast of the district was divided into G1, G2 and G3 zones when the construction project was delineated, with G1 zone being the nearest to the construction site.
He showed underwater photos taken by environmental groups of the crustose coralline algae — which cement the reef, aiding reef-building corals — in G1 zone decreasing from 84 percent coverage in April 2019 to about 10 percent in April 2023.
Caissons used in the project disrupted the ooze layer, burying the algal reefs in G2 zone in ooze, while the newly built port diverted sea currents, leading to sand accumulating along the coast, Pan said.
This is why pieces of dead algal reef proliferated after construction began in 2019, he said, adding that the accumulated sand and ooze near the reefs has become inhabited by non-reef-building algae.
Pan asked CPC to conduct an investigation with environmentalists during low tide on Wednesday morning next week to find out whether the observation results were true.
He urged government authorities to establish a response unit to reverse the algal reef decline.
CPC representative Huang Chih-chien (黃志堅) said sand accumulation fluctuated mainly with seasonal climate effects such as typhoons and the northeast monsoon every December.
Regarding ooze stirred up by caisson construction, Huang said they were placed indirectly on the seabed with a layer of pads and a layer of stones in between.
The project used more than 300 caissons, a number “disproportionate” to the vastness of the ocean, he said, adding that improperly discharged industrial sludge could be a cause of the siltation.
The shrinking coverage of crustose coralline algae could be caused by rising sea temperatures and increased seawater turbidity along the west coast of Taiwan, rather than solely by the siltation, Huang said, citing research by National Taiwan Ocean University.
CPC would cooperate in conducting on-site investigations along with representatives from environmental groups to examine algal reef conditions, as well as provide research data for review, he said.
University vice president and aquaculture professor Nan Fan-hua (冉繁華) said research showed that coral growth does change with sea temperatures and seawater turbidity.
Reef-building coralline algae are declining while the non-reef-building types are increasing not only around the construction site, but in other areas of the sea, he said, adding that damage caused by siltation to algae reefs at the tissue level could be restored after the ooze and sand is removed.
The university has achieved fruitful outcomes in the restoration of Polycyathus isabela, Nan said.
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